Aerial conductor.



C. S. FRANKLIN. AERIAL CONDUCTOR. APPLICATION FILED DEC. 31. 1913.

mama? Patented June 1, 1915.

. ran era FTQE.

CHARLES SAMUEL FRANKLIN,

OF LONDON, ENGLAND, ASSIGNOR T MARCONI WI RE- LESS TELEGRAPH COMPANY OF AMERICA, OF NEW YORK, N. Y., A CORPORATION OF NEW JEESEY.

To all whom it may concern Be it known that I, CHAnLEs SAMUEL FRANKLIN, a subject of the King of Great Britain, residing at Marconi House, Strand, London, England, have invented new and v useful Improvements in Aerial Conductors,

to be transmitted this is-done the dimensions of the aerial are of which the following is a specification.

lfhe object of this invention is to provide an improved aerial which shall have good directional properties as well as be an efiicient radiator and absorber of electromagnetic waves.

It is known that an aerial consisting of one or more turns of wire wound in the shape of a rectangle or other polygon and laced with its plane vertical to the earth as good directional properties for transmitting and receiving electro-mag'netic wa es but is a very inefiicient radiator or absorber of these waves. It is also known that the radiation and absorption are greatly improved by employing one turn inclosing as large an area as possible and by inserting a small condenser in series with the aerial so that the latter is in tune with the wave or received. Even when still small compared with the wavelength and the aerial is therefore an inefficient radiator and absorber of electro-magnetic waves.

According to this invention condensers are introduced at approximately equal disthe closed aerial circuit, the capacity of each condenser being so adjusted that for the particular wave length to be used it just compensates for the inductance of the part of the next condenser.

The accompanying drawing illustrates my invention, Figure 1 being a diagram showing an aerial constructed in accordance with the invention and Fig. 2 a diagram of a modification in Which the ear'thforms part of the lower side of the rectangle.

a is the aerial conductor having condensers 0 introduced at various points. These Specification of Letters Patent.

I aerial the circuit joining it to;

AERIAL connncron.

condensers are contained in waterproof cases Z supported by masts e and coils f of high inductance are placed in parallel with each condenser to prevent electrostatic charges accumulating. v

The distance between the two extreme parts of such an aerial circuit may be as great as half a wave length and the aerial Will then be a very powerful radiator and absorber of electro-magnetic waves andat the same time will have the good directional properties of a small closed circuit.

What I claim is 1.' In a system of wireless telegraphy, an aerial conductor consisting of a closed circuit in a vertical plane, having condensers distributed around it, the capacity of each being such that it compensates for the inductance of the part of the conductor joining it to the next condenser, substantially as described.

2. In a system of wireless telegraphy, an

conductor consisting of a closed circuit in a vertical plane, having condensers distributed around it, the capacity of each being such that it compensates for the inductance of the part of the conductor, joining it to the next condenser, and a coil of high inductance substantially as described.

3. In a system of wireless telegraphy, an aerial conductor consisting of a closed circuit in a vertical plane, having condensers distributed around it, the capacity of each being such that it compensates for the inductance of the part of the conductor joining it to the next condenser, a coil of high resistance shunting each condenser, and a water proof casecontaining each condenser and its inductance, substantially as described.

CHARLES SAMUEL FRANKLIN,

Witnesses: Y

K J. ST. VINCENT PLETTS, GE0RGE JAMES ,VTRUSTY.

a Patented June 1, 1915 Application filed December 31, 1913. Serial No. 809,607. 

